大气压辉光放电向弧光放电的转化特性研究

Characteristic of discharge of glow-to-arc at atmosphere pressure

实现稳定的大气压空气辉光放电一直是一个难题,放电极易转换成电弧,且转换时间非常短。基于针-针,针-板两种电极结构,利用MAXWELL 2D仿真软件,分析电极间的电场分布;计算了氮气、氧气所需要的击穿场强,采用脉冲电源驱动,测量放电过程的转换时间。研究显示:两种电极的电场分布和场强最大值不同;放电转化时间为几十纳秒。相同外界条件下的针-板电极比针-针电极具有更大的场强最大值,空间平均场强也比针-针电极大;1 mm间距下的针-针电极击穿时间为25 ns,针-板电极为20 ns。为研究大气压脉冲放电,以及研制纳秒级脉冲功率电源提供了一个时间参数。

To achieve the stable atmospheric pressure glow discharge （APGD） in air is always a difficult problem, it is easy to converter into arc, and the process is very quick. Based on two electrode structure as needle-needle and needle-plate, MAXWELL 2D was used to analyze the distribution of electric field between electrodes; the breakdown of electric field about nitrogen and oxygen was calculated, and through pulsed power, the conversion time of the discharge was measured. The research shows that the electric field distribution and the maximum electric field are different between two electrodes, and the conversion times are tens of nanoseconds. The needle - plate electrode has the greater maximum field than the needle - needle electrode at the same condition; the conversion times of needle - needle electrode is 25 ns, and the needle - plate electrode are 20 ns. A time parameter was provided to study the basic theory of APGD, and develop the nanosecond pulse power supply.